By enabling Duplicate Detection, NetSuite compares Customer and Contact records and will notify you of possible duplicate records.
There are four types of records you can detect duplicates for:
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Customer
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Vendor (Supplier)
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Partner
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Contact
How to Enable Duplicate Detection
1. Go to Setup.
2. Click Company.
3. Click Enable Features.
4. Select Company subtab.
5. Check Duplicate Detection & Merge.
6. Click Save.